Top-down control of conditioned overconsumption is mediated by insular cortex Nos1 neurons.
Cell Metab
; 33(7): 1418-1432.e6, 2021 07 06.
Article
em En
| MEDLINE
| ID: mdl-33761312
ABSTRACT
Associative learning allows animals to adapt their behavior in response to environmental cues. For example, sensory cues associated with food availability can trigger overconsumption even in sated animals. However, the neural mechanisms mediating cue-driven non-homeostatic feeding are poorly understood. To study this, we recently developed a behavioral task in which contextual cues increase feeding even in sated mice. Here, we show that an insular cortex to central amygdala circuit is necessary for conditioned overconsumption, but not for homeostatic feeding. This projection is marked by a population of glutamatergic nitric oxide synthase-1 (Nos1)-expressing neurons, which are specifically active during feeding bouts. Finally, we show that activation of insular cortex Nos1 neurons suppresses satiety signals in the central amygdala. The data, thus, indicate that the insular cortex provides top-down control of homeostatic circuits to promote overconsumption in response to learned cues.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Hipernutrição
/
Óxido Nítrico Sintase Tipo I
/
Comportamento Alimentar
/
Córtex Insular
/
Neurônios
Limite:
Animals
Idioma:
En
Revista:
Cell Metab
Assunto da revista:
METABOLISMO
Ano de publicação:
2021
Tipo de documento:
Article